Make RSVPs a custom comment type

[carstingaxion]

Is your enhancement related to a problem? Please describe.

• [Proposal] Migrate GatherPress Events Data to Custom Table Structure #523
• Export & Import RSVPs #665

Designs

• RSVP status could become a custom taxonomy registered on the comments object type. Here In pseudo-code:
  <?php register_taxonomy_for_object_type( 'rsvp_status', 'comment‘ ); ?>

Advantages:

• allows to create variations of comment related blocks
• Does not need a user-account to RSVP
• No need for the currently used custom DB table

Problems:

• potential to being accessible in public via comment_feed
• https://core.trac.wordpress.org/ticket/12668
• with no reliance on a logged-in user, need to rethink GP-596: Make online link available after user says they are attending. #597

further Reading

• like a user taxonomy

Describe alternatives you've considered

No response

Code of Conduct

• I agree to follow this project's Code of Conduct

[carstingaxion]

What about comments and users?

Comments and users are object types that at this point do not support object subtypes. While there is technically a comment_type field in the comments database table, comment types are not clearly scoped in core (for example there is no register_comment_type()), so it was decided to leave them out for now.

For this reason, there are no register_comment_meta() or register_user_meta() functions at this point.

If you are interested in more about the history of these changes, you can read the initial background post for these efforts, or look into the related ticket #38323.

https://make.wordpress.org/core/2018/07/27/registering-metadata-in-4-9-8/

[carstingaxion]

Let us get some Inspiration from

Roles to Taxonomy

WordPress plugin to store user roles and user levels in a taxonomy, for performance.

https://github.com/humanmade/roles-to-taxonomy/blob/master/inc/namespace.php

[MervinHernandez]

RE 657 🚩 June 15 Review

✅ Read / not sure what this is about, and the merit of it. I see it's in Mike's hands, so if my assist is needed, we can get to understand this more soon.

[mauteri]

Mervin this is about how we store data. Right now we have a custom table for RSVP. This is a move to making RSVP save to comments table as a custom comment type. This allows for greater flexibility with ideas we have for non-registered user RSVP in the future, does away with a custom table, and makes exporting/importing RSVP data possible. I have made decent progress on this already.

[MervinHernandez]

✅ Reviewed June 22

Noted Mike - saw you remarked on a related ticket 692